comparision if {
    1 == 1
    2 != 1
    "abc" == "abc"
    "abd" != "abc"
    {1, "a"} == {"a", 1, "a"}
    {1, "b"} != {"a", 1, "a"}
    [1, {1, 2}] == [1, {2, 1, 2}]
    [{1, 2}, 1] != [1, {2, 1, 2}]
    {"x": 1, "y": 2} == {"y": 2, "x": 1}
    {"x": 2, "y": 1} != {"y": 2, "x": 1}
    {"x": 1} != {"y": 2, "x": 1}
    1 < 3.14
    3.14 >= 1
    "abcxx" < "abd"    # lexicographical order
    "abd" >= "abcxx"   # lexicographical order
}
